如何通过反射将字符串分配给整数字段

所以这是让我难过的代码：

private static void AssignId(object entity, string id)
        {
            var idFieldInfo = entity.GetType().GetProperties().SingleOrDefault(it => it.GetCustomAttributes(typeof(KeyAttribute), false).Any());
            if (idFieldInfo != null)
            {
                var type = idFieldInfo.PropertyType;
                if (type == typeof(byte))
                {
                    idFieldInfo.SetValue(entity, Convert.ToByte(id), null);
                }
                else if (type == typeof(short))
                {
                    idFieldInfo.SetValue(entity, Convert.ToInt16(id), null);
                }
                else if (type == typeof(int))
                {
                    idFieldInfo.SetValue(entity, Convert.ToInt32(id), null);
                }
                else if (type == typeof(long))
                {
                    idFieldInfo.SetValue(entity, Convert.ToInt64(id), null);
                }
                else if (type == typeof(sbyte))
                {
                    idFieldInfo.SetValue(entity, Convert.ToSByte(id), null);
                }
                else if (type == typeof(ushort))
                {
                    idFieldInfo.SetValue(entity, Convert.ToUInt16(id), null);
                }
                else if (type == typeof(uint))
                {
                    idFieldInfo.SetValue(entity, Convert.ToUInt32(id), null);
                }
                else if (type == typeof(ulong))
                {
                    idFieldInfo.SetValue(entity, Convert.ToUInt64(id), null);
                }
            }
        }

有没有更聪明的方法来分配字符串值对应的整数

if (idFieldInfo != null)
{
     var type = idFieldInfo.PropertyType;
     idFieldInfo.SetValue(entity, Convert.ChangeType(id, type), null);
}